Firearm barrel



FIG. 1 is an isometric view of the firearm barrel;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a cross-sectional view thereof taken along line 6-6 of FIG. 2; and,

FIG. 7 is a cross-sectional view thereof taken along line 7-7 of FIG. 2.

The broken lines represent a boundary of the claimed design that form no part of the claimed design. 

CLAIM The ornamental design for a firearm barrel, as shown and described. 